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What is a “Bitmap heap scan” in a query plan?
..."Bitmap heap scan", I know this often happens
when I execute a query with OR in the condition.
1 Answer
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
...tion are not a delimited list of operands, but a single expression.
Read more about the comma operator here.
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What does status=canceled for a resource mean in Chrome Developer Tools?
...r problem where Chrome was canceling requests to load things within frames or iframes, but only intermittently and it seemed dependent on the computer and/or the speed of the internet connection.
This information is a few months out of date, but I built Chromium from scratch, dug through the source...
How to quickly and conveniently create a one element arraylist [duplicate]
...ere that can do this in 1 line? I can't find it anywhere in Collections , or List .
8 Answers
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How do you match only valid roman numerals with a regular expression?
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You can use the following regex for this:
^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$
Breaking it down, M{0,4} specifies the thousands section and basically restrains it to between 0 and 4000. It's a relatively simple:
0: <empty> m...
How to add extra namespaces to Razor pages instead of @using declaration?
Is there some sort of magic I need to use to get the namespaces in the pages/namespaces element in the webconfig?
5 Answe...
Returning redirect as response to XHR request
... 302 redirect leads to a 200, then your program acts identically as if the original request led directly to a 200.
This has been both my experience and the behavior called out in the spec.
2016 Update: Time has passed, and the good news is that the new fetch() API is spec'd to offer finer-grained ...
Why are empty catch blocks a bad idea? [closed]
...ly empty try-catch is a bad idea because you are silently swallowing an error condition and then continuing execution. Occasionally this may be the right thing to do, but often it's a sign that a developer saw an exception, didn't know what to do about it, and so used an empty catch to silence the ...
What are the differences between -std=c++11 and -std=gnu++11?
...ferences between -std=c++11 and -std=gnu++11 as compilation parameter for gcc and clang? Same question with c99 and gnu99 ? I know about C++ and C standards, it's the differences in the parameters that interest me.
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Is module __file__ attribute absolute or relative?
...aded, if it was loaded from a file. The __file__ attribute is not present for C modules that are statically linked into the interpreter; for extension modules loaded dynamically from a shared library, it is the pathname of the shared library file.
From the mailing list thread linked by @kindall in...